

from tkinter import *

m = PanedWindow(showhandle=True,
    sashrelief=SUNKEN,
    handlepad=-10)

m.pack(fill=BOTH,expand=1)


left  =Label(m,text="left paned")
m.add(left)



m2 = PanedWindow(orient=VERTICAL,
    showhandle=True,
    sashrelief=SUNKEN)
m.add(m2)

top  =Label(m2,text="top paned")
m2.add(top)


bottom = Label(m2,text="bottom paned")
m2.add(bottom)



mainloop()